Flexo Printing Roll Speed Control via Crimping Compensation
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Solution Overview
Problem
The existing methods for controlling the rotational speed of a printing roll with a resilient sleeve in flexo printing presses require complex and costly sensor systems to determine indentation depth, leading to increased wear and potential slip between components due to inefficient speed adjustment.
Innovation Solution
A method that determines the rotational speed of a printing roll in a simulated neutral gear condition, using adjusting values between the printing roll and adjacent rolls to generate a control curve for speed control, thereby indirectly determining the crimping effect and adjusting the rotational speed without additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex sensor systems are used to determine indentation depth, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent creates a control curve that copies the relationship between adjusting value and rotational speed by measuring in a simulated neutral gear condition. This control curve serves as a simplified model that replaces complex direct measurement systems, allowing the system to determine crimping effects indirectly through speed measurements rather than direct indentation depth sensing
Solution Approach 2:
The patent replaces complex mechanical sensor systems with a control-based approach using rotational speed measurements. By substituting direct mechanical indentation measurement with rotational speed measurement in a simulated neutral gear condition, the system achieves the same control objective with simpler components
2Productivity
If the printing roll speed is increased due to crimping effects, then productivity is improved, but wear of the drive device increases
Solution Approach 1:
The patent implements a feedback control system that continuously measures the actual rotational speed of the printing roll and compares it to the target speed. Based on this feedback, the control unit adjusts the drive device to compensate for speed increases caused by crimping effects, maintaining optimal operating conditions and preventing excessive wear
Solution Approach 2:
The patent dynamically adjusts the target rotational speed based on the adjusting value and the control curve. Instead of maintaining a fixed speed, the system adapts the target speed to account for crimping effects, allowing the printing roll to operate at optimal speeds under varying conditions while preventing drive device overload
3Productivity
If the printing roll speed is not slowed down, then productivity is maintained, but slip between components occurs leading to increased wear
Solution Approach 1:
The control system uses feedback from rotational speed measurements to detect when crimping effects cause speed deviations. By comparing actual speed to target speed, the system identifies slip conditions and adjusts the drive device to prevent further slip, maintaining productivity while protecting components from wear
Solution Approach 2:
The patent performs preliminary determination of the control curve in a simulated neutral gear condition before actual printing operations. This preliminary characterization allows the system to predict and prevent slip conditions before they occur, adjusting speeds proactively rather than reactively
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces wear on the drive device and prevents slip between components by efficiently compensating for the crimping effect, allowing for cost-effective and simple control of the rotational speed, reducing the need for complex sensor systems and minimizing wear on the printing roll and medium.
Implementation Method 1
during printing a deformation of the resilient printing sleeve occurs
Implementation Method 2
a resilient printing sleeve is used with these printing presses
Data Source
AI summary
The invention relates to a method for the control of the rotational speed for a drive device (20) of a printing roll (10) with a resilient printing sleeve (12) of a flexo printing press (100) comprising the following steps:Determination of a first rotational speed (V1) of the printing roll (10) in the free wheeling without active drive device (20) with a first adjusting value (B1),Determination of a second rotational speed (V2) of the printing roll (10) in the free wheeling without active drive device (20) with a second adjusting value (B2),Generation of a control curve (30) of the rotational speed related to the adjusting value on the basis of the determination steps,Usage of the control curve (30) for the control of the rotational speed of the printing roll (10) with an active drive device (20).